New voltage limiter questions - 67 Dart 270

I had assumed your other car was A-body rallye panel ( Barracuda ). Charger aint A-body. How to open the gauge I typed earlier doesn't exactly apply to what you have here. Close enough to geter done ( if you intend to open it ). Anyway...
The noise cap goes at 12 volt all examples. If you dont have a ring terminal on a blue wire to attach at that post along with the noise cap' you'll have assume the 12 volt supply is inside the cluster housing through the side of this gauge can.
Only "neg" is chassis. This gauge has chassis ground connection right in the middle of the back just like the other 3 post gauge examples though. Lift it and look at its back. There's a thin strip of metal captured under those 2 bent tangs you can see now. If the gauge is good you only need to cover that with a couple layers of electric tape to disable the internal limiter. First... measure ohms "A" to "S".
There wont be a wire to "A" ( marked 5V this example ) post of this gauge. That connection/current path is inside this gauge. That 5 volts does have to get out again to G3 and G3A routed to the other 2 thermal instruments ( yellow wires? I forget ).
"S" post(s) gets sender wires. Temp is purple, oil is gray.
And just so you're aware, transformer for electro-luminescent stores a charge that will knock your socks off.